package com.bjc.principle.opc;

/**
 * @program: DesignPattern
 * @description: 开闭原则
 * @author: bjc
 * @create: 2020-12-13 17:36
 */
public class Ocp {

    public static void main(String[] args) {
        //使用看看存在的问题
        GraphicEditor graphicEditor = new GraphicEditor();
        graphicEditor.drawShape(new Rectangle());
        graphicEditor.drawShape(new Circle());
        graphicEditor.drawShape(new Triangle());
    }
}
//这是一个用于绘图的类[使用方]
class GraphicEditor{
    //接收Shape对象，然后根据type，来回值不同的图形
    public void drawShape(Shape s){
        if (s.m_type==1){
            drawRectangle(s);
        }else if (s.m_type==2){
            drawCircle(s);
        }else if (s.m_type==3){
            drawTriangle(s);
        }
    }
    //绘制矩形
    public void drawRectangle(Shape r){
        System.out.println("绘制矩形");
    }
    //绘制圆形
    public void drawCircle(Shape r){
        System.out.println("绘制圆形");
    }
    //绘制三角形
    public void drawTriangle(Shape r){
        System.out.println("绘制三角形");
    }
}
//Shape类  基类
class Shape{
    int m_type;
}

class Rectangle extends Shape{
    Rectangle(){
        super.m_type = 1;
    }
}

class Circle extends Shape{
    Circle(){
        super.m_type = 2;
    }
}

//新增画三角形
class Triangle extends Shape{
    Triangle(){
        super.m_type = 3;
    }
}
